I am also researching the Mullikin/Mulliken/Mulligan family which is on my mothers side. My great grandmother is Ada Geneva Mulligan/Mullikin and one of her siblings was Richard Edgar Sr. Their parents were Richard Thomas and Barbara Ellen. I have a bit more info in addition if you like. It can be tough to find this family with so many last name changes listed due to how they were interpreted and written down. Would love to trade any info.